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Kindle Hacking: It's a Lovely Little Linux Box

"To open up the Kindle, I used the USB networking debug mode
Amazon left hanging around when they first shipped the Kindle 2, a
statically linked telnetd and a cross-compiler to bootstrap myself.
From there, I built a daemon that can convert DRM-free PDFs and
ePubs into something Amazon's reader on the Kindle can deal
with."